Rice left in a sack is (S(d)=64-3d) kg. How much rice will remain at (d=8)?
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Answer and explanation
Correct answer: 40 kg
Given \(S(d)=64-3d\). Substituting \(d=8\), \(S(8)=64-3\times8=64-24=40\) kg. Therefore, 40 kg is correct. The value 56 kg would result from subtracting 8 from 64, which does not follow the given expression. Exam tip: Write the substitution with brackets and perform multiplication before subtraction.
Frequently asked questions
What is the correct answer to this question?
40 kg
Why is this the correct answer?
Given \(S(d)=64-3d\). Substituting \(d=8\), \(S(8)=64-3\times8=64-24=40\) kg. Therefore, 40 kg is correct. The value 56 kg would result from subtracting 8 from 64, which does not follow the given expression. Exam tip: Write the substitution with brackets and perform multiplication before subtraction.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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